Polash Banerjee

• PhD
• Saha Institute of Nuclear Physics

The high spin states of ¹³⁶Ce (Z = 58) were investigated via ¹²⁴Sn(¹⁶O, 4n)¹³⁶Ce fusion evaporation reaction at MeV. The γ-γ coincidence technique is used for placing the γ-transitions in the level scheme. The spin and parity of the levels have been assigned on the basis of results of the angular correlation and linear polarisation measurements, re...

Background: The band structures of Ce(Z=58) nuclei with A~135 were studied extensively with the physics interest such as triaxiality and rotation like-sequence i.e. shears mechanism etc. The level structures of 136 Ce, with 58 protons and 78 neutrons, were predicted to arise from the interaction between valence proton particles above the Z = 50 maj...

Structures of negative parity multi-quasiparticle states in ¹²⁷Xe have been investigated through in-beam γ-ray spectroscopy. Excited states were populated via the ¹²²Sn(⁹Be, 4nγ)¹²⁷Xe fusion-evaporation reaction at E beam = 48 MeV. Two new negative parity bands have been identified and their structures have been discussed using the triaxial project...

Excited states in [Formula: see text]Xe were populated via [Formula: see text]Sn( ⁹ Be, 5n[Formula: see text]) and [Formula: see text]Sn( ⁹ Be, 3n[Formula: see text]) fusion-evaporation reactions, respectively, at a beam energy of 48[Formula: see text]MeV. The electromagnetic (electric or magnetic) nature and multipolarity of some inter-band [Formu...

In-beam [Formula: see text]-ray spectroscopy of [Formula: see text]I was carried out following [Formula: see text]Sn([Formula: see text]Li, 4n[Formula: see text]) fusion-evaporation reaction at a beam energy of 33 MeV. Ratio of the electric dipole (E1) and electric quadrupole (E2) transition probabilities [B(E1)/B(E2)] for the transitions depopulat...

A family of four odd parity bands in 127Xe has been investigated via in-beam γ-ray spectroscopy and conclusive evidence for the first and second phonon longitudinal wobbling excitations has been found. Spectroscopic measurements confirm the predominant E2 character of the ΔI = 1 transitions between the wobbling bands. This provides the first experi...

The excited states of ¹³⁹Pm is investigated via ¹²⁷I(¹⁶O, 4n)¹³⁹Pm reaction at 84 MeV beam energy. The spin and parity of several states have been determined from the results of angular correlation (RDCO) and linear polarization asymmetry ( ${{\rm{\Delta }}}_{{asym}}$ ) measurements. The features of four positive parity bands have been determined....

High spin states in ¹²⁷I were populated via ¹²⁴Sn(⁷Li, 4nγ) fusion-evaporation reaction at Ebeam = 33 MeV. Level scheme of ¹²⁷I has been updated by placing new γ-rays and also by confirming the spin/parity of several energy levels. Two new levels at Ex = 2628 and 3199 keV have been identified which are found to decay into the negative parity πh11/2...

The electromagnetic properties of the γ-transitions, decaying from the γ-vibrational states of ¹²⁶Xe, have been studied via ¹²²Sn(⁹Be, 5nγ) fusion-evaporation reaction at a beam energy of 48 MeV. The level scheme has been updated by placing the 82+→81+ (ΔI=0) and the 71+→61+ (ΔI=1) γ-transitions. Spin and parity of several excited states have been...

Rotational bands built on positive parity \( s_{1/2} \), \( d_{3/2} \), and \( g_{7/2} \) valence neutron orbitals in \( ^{127}\hbox {Xe}\) have been investigated via in-beam \( \gamma \) ray spectroscopy. Excited states belonging to these one-quasineutron bands were populated via \(^{122} \hbox {Sn}( ^{9} \hbox {Be}, \hbox {4n} \gamma \)) fusion-e...

Excited states of ¹²⁷Xe were populated in the ¹²²Sn(⁹Be, 4nγ) fusion-evaporation reaction at a beam energy of 48 MeV. A sequence of ΔI = 2 γ-transitions has been observed above the Iπ = 19/2⁺ state at 2307 keV. Spin and parity of the states belonging to this band have been assigned firmly. The dynamic moment of inertia of this band is found to be l...

Excited states in 125 Te have been populated via the 122 Sn(9 Be, α2nγ) fusion-evaporation reaction. The positive parity band has been extended up to ≈ 2.3 MeV by placing a 693 keV γ-transition. Spin and parity of several excited states have been confirmed by the present spectroscopic measurements. I π = 23/2 + has been assigned to the 2569 keV sta...

Low lying states of ¹⁹⁸Hg have been investigated via ¹⁹⁷Au(⁷Li,\(\alpha\)2n\(\gamma\)) reaction at \( E_{\mathrm{beam}} = 33, 38\) MeV and the members of the \(\gamma\)-vibrational band have been identified. Results are compared with the systematic of this mass region and found in agreement. The observed band structures have been interpreted using...

DOI:https://doi.org/10.1103/PhysRevC.98.059902

A self-supporting ¹²²Sn target has been fabricated via rolling of an ingot of 99.3% enriched ¹²²Sn at the target laboratory of Inter-University Accelerator Centre, New Delhi. The isotopic purity of the target has been verified. The prepared target has been used in a γ-ray spectroscopy experiment to study the high spin states of Xe and Te nuclei. Re...

Excited states of Zr87, populated in the reaction Ni60(P31, 3pn) at a beam energy of 112.5 MeV, have been studied. Experimental information on two negative-parity bands has been significantly upgraded with the addition of new γ rays and levels. Small values of the reduced transition probability B(E2) and a general absence of a measurable Doppler sh...

Low lying states of $^{198}$Hg have been investigated via $^{197}$Au($^{7}$Li, $ \alpha $2n$ \gamma $)$ ^{198} $Hg reaction at E$ _{\text{beam}} $ = 33 MeV and 38 MeV and the members of $ \gamma $-vibrational band have been identified. Results are compared with the systematic of this mass region and found in agreement. Observed band structures have...

The excited states of ¹²⁷I were populated via ¹²⁴Sn(⁷Li, 4nγ) fusion-evaporation reaction at Ebeam= 33 MeV. A strongly coupled ΔI= 1 band has been established above 2423keV state with Jπ= 19 / 2 ⁻ as bandhead, likely to be associated with the three-quasiparticle configuration. Spin and parity of these multi-quasiparticle states have been confirmed...

Excited states in Xe127 were populated via Sn122(9Be,4nγ) fusion-evaporation reaction at Ebeam=48 MeV. A rotational band above an isomeric state at 2730.3 keV has been established. Jπ=23/2+ has been assigned unambiguously to the bandhead. Structural features, configuration, and reduced hindrance factor per degree of K-forbiddenness (fν) have been d...

Nuclei in the A ~ 110 mass region exhibit interesting structural features. One of these relates to the process by which specific configurations, built on the excitation of one or more protons across the Z = 50 shell-gap, manifest as collective rotational bands at intermediate spins and gradually lose their collectivity with increase in spin and ter...

Excited states of ¹²⁷Xe were populated via fusion-evaporation reaction. A level at 2306.7 keV has been established instead of the previously reported two different levels at 2307 keV. has been assigned to this level on the basis of the DCO ratio and linear polarization asymmetry of decaying γ-rays. A weak γ-ray of 840.2 keV, decaying from this stat...

High spin states in ¹²⁷Xe have been investigated via ⁹Be induced fusion-evaporation reaction at 48 MeV. Spin and parity of excited states up to \( \sim \frac {47}{2} \hbar \) have been confirmed from angular correlation and linear polarization results. Rotational alignment of the second pair of h11/2 neutrons has been observed at \(\hbar \omega \si...

The high-spin states in Ho153 have been studied by the La57139(Ne20,6n) reaction at a projectile energy of 139 MeV at the Variable Energy Cyclotron Centre (VECC), Kolkata, India, utilizing an earlier campaign of the Indian National Gamma Array (INGA) setup. Data from γ−γ coincidence, directional correlation, and polarization measurements have been...

The high-spin states in 153Ho, have been studied by 139 57 La(20Ne, 6n) reaction at a projectile energy of 139 MeV at Variable Energy Cyclotron Centre (VECC), Kolkata, India, utilizing an earlier campaign of Indian National Gamma Array (INGA) setup. Data from gamma-gamma coincidence, directional correlation and polarization measurements have been a...

The structure of collective bands in Sn113, populated in the reaction Mo100(F19,p5n) at a beam energy of 105 MeV, has been studied. A new positive-parity sequence of eight states extending up to 7764.9 keV and spin (39/2+) has been observed. The band is explained as arising from the coupling of the odd valence neutron in the g7/2 or the d5/2 orbita...

Prompt gamma-ray spectroscopy of fission fragments produced in the heavy-ion induced fusion-fission reaction Pb208(O18,f) at E=90 MeV has been performed. The relative isotopic yields of the fission fragments and the fragment mass distribution have been studied. Structures in the mass distribution have been discussed in the light of earlier results....

The design, construction and operational characteristics of a portable flash X-ray source driven by battery-powered compact Marx is reported. The novel configuration of compact Marx utilizes hollow capacitors in successive stages to enhance the erection reliability. The characteristic impedance of this system is ∼200Ω. At discharge of ∼22kV, >200kV...

A Marx generator delivers high power electrical pulse in very short duration and can be configured to be compact. This ultrafast coaxial Marx generator has also been developed without pulse shaping/peaking circuit. The results of 5-stage ultrafast coaxial Marx generator has a rise time of 800ps, maximum output voltage 75kv, pulse width(FWHM) of 1.5...

The excited states in 127I were investigated via in-beam gamma-ray spectroscopy techniques. The excited states were populated in reaction 124Sn (7Li, 4nγ) 127I at beam energy of 33 MeV. Multipolarities and linear polarization measurements were carried out for several transitions belonging to the negative parity band based on the πh11/2[550] 1/2-Nil...

Rotational bands in 113Sb, populated in the reaction 100Mo(19F,6n) at a beam energy of 105 MeV, have been studied. Two previously reported strongly coupled high-K bands have been extended and a new sequence of five states, linked to the positive-parity high-K band through interband transitions, is proposed. A comparison of the experimental B(M1)/B(...

A prototype of Multi-strip Multi-gap Resistive Plate chamber (MMRPC) with active area 40 cm x 20 cm has been developed at SINP, Kolkata as a new Time-Of-Flight (TOF) system with timing resolution sigma(t) < 120 ps and position resolution sigma(x) similar to 0.58 cm. The intention is to use multilayers of this type together with converter materials...

Excited states of 127I were populated via 124Sn(7Li,4nγ)127I fusion-evaporation reaction at beam energy of 33 MeV. Multipolarities of several transitions were determined and spins of corresponding states have been confirmed. The band-head spin and parity of an already reported band at 2901.2 keV has been confirmed. Based on the observed characteris...

A prototype of Multi-strip Multi-gap Resistive Plate chamber (MMRPC) with active area 40cm×20cm has been developed at SINP, Kolkata as a new Time-Of-Flight (TOF) system with timing resolution σt120ps and position resolution σx∼0.58cm. The intention is to use multilayers of this type together with converter materials as a high energy neutron (1GeV>E...

Excited states of 83Kr, populated in the 76Ge(11B, 3npγ) reaction at a beam energy of 50 MeV, have been studied. The ΔI = 1 band, built upon the 2,510.0 keV state, has been observed up to 5,639.4 keV with spin (27/2 − ). Mean lifetimes have been measured up to spin 23/2 − in ΔI = 1 band using the Doppler shift attenuation method. The B(M1) rates de...

. In the present work, the excited states of 113Sb were populated in the 100Mo(20Ne, p6n) reaction at a beam energy of 136 MeV. States only up to 59/2− were observed in the ΔJ = 2 band. Mean lifetimes for the five states (from 4460 to 7998 keV) were measured for the first time using Doppler shift attenuation method. An upper limit of the lifetime...

The two ΔI=1 bands in 111In, built upon the 3461.0 and 4931.8 keV states, have been studied. The bands were populated in the reaction 100Mo(19F, α4nγ) at a beam energy of 105 MeV. Mean lifetimes of nine states, four in the first and five in the second band, have been determined for the first time from Doppler shift attenuation data. The deduced B(M...

Compact Marx generators are known for delivering high power in very short duration and do not require any separate pulse shaping components. The design and operation of 10 stage coaxial Marx generator with fast rise time of 2.4 ns, maximum voltage 300 kV, pulse width 20 ns, energy 4.2 J and impedance 71 Ω has been presented. The Marx generator is c...

Response of gÀrays and cosmic muons Pulsed electron beam a b s t r a c t A prototype of Multi-strip Multi-gap Resistive Plate chamber (MMRPC) with active area 40 cm  20 cm has been developed at SINP, Kolkata as a new Time-Of-Flight (TOF) system with timing resolution s t o 120 ps and position resolution s x $ 0:58 cm. The intention is to use multi...

Summary form only given. Compact and low energy plasma foci have found many applications in recent years and hence attracted plasma physics scientists and engineers for research. In this paper we are presenting a low energy plasma focus les 36 Joules and voltages les 4 kV. The initiation of surface breakdown at low voltages and thereafter leading t...

In this paper an analytical formula for the measurement of the dielectric constant of materials having cylindrical shape is derived using cavity perturbation method. The formula is established using two known samples Teflon and Perspex at X-band frequencies and the results are compared with those obtained for rectangular samples.

The DeltaI=2 intruder band in Sn111, built upon the 4074.3 keV state, was studied. The states were populated in the Mo100(Ne20, alpha5n) reaction at a beam energy of 136 MeV. Mean lifetimes of five states up to 8737.2 keV (spin 43/2-) have been measured for the first time using the Doppler shift attenuation method. In addition, an upper limit of me...

The nucleus 155Tm has been studied by a detailed in-beam gamma spectroscopy following the reaction 144Sm(14N, 3n)155Tm, at a beam energy, , using a Compton suppressed gamma detector array. More than 25 new gamma transitions have been placed in the proposed scheme and the latter has been extended upto a spin-parity of (51/2−) at an excitation energy...

30P has been studied by in-beam γ-spectroscopy following the fusion-evaporation reaction 16O(16O,pn) at Elab=40 MeV, using the Indian National Gamma (Clover) Array (INGA) up to moderate spins (I=5). Polarization measurements of seven gamma rays have been performed for the first time. To understand the underlying structure of the levels and transiti...

Excited states of the positive-parity intruder band in 112Sn, populated in the 100Mo(20Ne, α4n) reaction at a beam energy of 136 MeV, have been studied. The band has been observed up to 11570.0 keV with spin (24+). Mean lifetimes have been measured for six states up to the 22+, 10335.1 keV level and an upper limit of the lifetime has been estimated...

The high spin states of 35Cl have been studied by in-beam γ-spectroscopy following the fusion–evaporation reaction 12C(28Si,αp)35Cl at Elab=70 and 88 MeV, using the Indian National Gamma (Clover) Array (INGA). Lifetimes of six new excited states have been estimated for the first time. To understand the underlying structure of the levels and transit...

The high spin states of 143Sm have been studied by in-beam γ-spectroscopy following the reaction 130Te(20Ne,7n)143Sm at Elab=137 MeV, using a Clover detector array. More than 50 new gamma transitions have been placed above the previously known Jπ=23/2-, 30 ms isomer at 2795 keV. The level scheme of 143Sm has been extended up to 12 MeV and spin-pari...

Excited states of 83Rb, populated in the 76Ge(11B, 4nγ) reaction at a beam energy of 50 MeV, have been studied. The unfavoured signature partner (α=−1/2) of the πg9/2 yrast band is proposed up to an excitation energy of 6669.4 keV and spin (31/2+). Lifetimes have been estimated for three states belonging to the favoured α=+1/2 band. The B(E2) value...

The lifetime of the 3163 keV, 7/2$^-$ isomeric state in $^{35}Cl$ that decays by a stretched M2 transition to the $3/2^+$ ground state, has been re-measured using the Doppler Shift Attenuation Method, by gating on the 1185 keV transition which directly feeds this state. This eliminates the uncertainties in the measurement arising from the direct fe...

Spintronic materials, employing the spin of carriers as a medium for sending information beside their charges, have drawn significant attention of scientists since the last decade for their uses in multifunctional and energy saving devices. Manganese doped cadmium telluride, Cd1-xMnxTe, is reported as a material for spin control under the influence...

The 114Cd(alpha,xn) reaction has been studied for Ealpha=35-55MeV following neutron emission and gamma-ray deexcitation. Excitation functions of various (alpha,xn) channels measured from gamma-ray yields have been compared with theoretical calculations based on ALICE-91 and CASCADE codes. Neutron energy spectra were generated from gamma-gated neutr...

As a part of the INGA collaboration, a six Clover array with BGO anti-Compton shield has been set up at VECC in August this year by the participating groups and three experimental runs have been successfully completed. Earlier, a series of test experiments were carried out with a view to explore the relative contributions from various reaction proc...

The high spin level structure of 104Ag has been extended to Iπ=20+ and excitation energy of 7.159 MeV through the discrete line γ-ray spectroscopy. The negative parity ground state band has been confirmed and extended to Iπ=18−. Two new nonyrast dipole bands, one with positive and the other with negative parity, have been observed. The parities of...

The high spin states of 103Ag have been populated through the 76Ge(35Cl,α4nγ)103Ag reaction using 132-MeV 35Cl beam. The presence of a positive parity ground state band and two negative parity bands decaying predominantly by M1 transitions in 103Ag has been confirmed. In addition, seven new crossover E2 transitions have been observed in the negativ...

This brief contains an investigation on the method for obtaining a stable low resistance ohmic contact to p-CdTe thin film. The contact was obtained by introducing a thin Cu_xO (0 < x ≤ 1) layer in between the metal and CdTe. The oxide layer mediated the contact by a charge polarization effect. The specific contact resistances between met...

The Clover detectors in their addback mode are excellent tools for detecting high-energy gamma rays . The characteristics of these detectors, at energies above , are usually determined from simulation data or from extrapolation of the empirical data. This is the first time that the characteristics of a Compton suppressed Clover germanium detector h...

The Clover detectors in their addback mode are excellent tools for detecting high-energy gamma rays (⩾2MeV). The characteristics of these detectors, at energies above 2MeV, are usually determined from simulation data or from extrapolation of the empirical data. This is the first time that the characteristics of a Compton suppressed Clover germanium...

The effect of inelastic excitation of exotic light projectiles (proton- as well as neutron-rich) $^{17}$F and $^{11}$Be on fusion with heavy target has been studied at near-barrier energies. The calculations have been performed in the coupled channels approach where, in addition to the normal coupling of the ground state of the projectile to the co...

We study theoretically fusion of the light proton-rich exotic nuclei $^{17}$F and $^8$B at near-barrier energies in order to investigate the possible role of breakup processes on their fusion cross sections. To this end, coupled channel calculations are performed considering the couplings to the breakup channels of these projectiles. In case of $^{...

The sequence of states built on the second 7/2+ state in 121,123,125I are interpreted to be associated with the low-K prolate πg7/2[420]1/2 Nilsson orbital with admixtures from the nearby πd5/2[422]3/2 and πd5/2[431]1/2 orbitals on the basis of the particle-rotor model calculations. With the ground-state bands in these nuclei being already explaine...

The nucleus 77Br has been studied in the reaction 65Cu(16O, 2p2n) at E=75 MeV. Lifetimes have been measured for several states using the Doppler-shift attenuation technique. The B(E2) values for the inband transitions, deduced from the lifetime results, reflect strong collectivity for both the positive-parity yrast band (band 1) and the ground-stat...